Are there any stream combinator libraries for dart?

Question

Does anyone know of any stream combinator libraries for dart? Things like joining multiple Stream into one Stream, split, combine(Stream, Stream) -> Stream<(A, B)>, etc.

See also http://stackoverflow.com/questions/36571924/how-can-i-merge-multiple-streams-into-a-higher-level-stream — Günter Zöchbauer, Jul 18 '16 at 12:08

score 3 · Answer 1 · answered Jun 10 '13 at 11:47

3

I'm not aware of a stream combinator library, but you could try to use StreamController to join streams.

Stream join(Stream a, Stream b) {
  var sc = new StreamController();
  int countDone = 0;
  done() {
    countDone++;
    if (countDone == 2) {
      sc.close();
    }
  }
  a.listen((e) => sc.add(e), onDone: done);
  b.listen((e) => sc.add(e), onDone: done);

  return sc.stream;
}

Warning: untested code.

answered Jun 10 '13 at 11:47

Seth Ladd

112,095
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196
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Yes, that's basically what I wrote, but there are problems that I pointed out here. http://stackoverflow.com/questions/17018427/dart-how-do-i-implement-stream-join-that-preserves-the-order-of-incoming-items/17019119?noredirect=1#comment24596762_17019119 – jz87 Jun 10 '13 at 16:55

score 1 · Answer 2 · answered Jul 14 '14 at 18:14

1

Check out my library Frappe. It's loosely inspired by Bacon.js, and has a bunch of methods for combining streams.

answered Jul 14 '14 at 18:14

Dan Schultz

196
3

Are there any stream combinator libraries for dart?

2 Answers2